[ Passive Voice and Modals ]
They _________________________ complete their parts of the assignment, or we will fail.
A. have
B. has to
C. must to
D. must
Select your answer:
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Grammar › View________ traveling is educational, it can also be stressful and expensive.
A. Since
B. Providing
C. While
D. Even
Subject Verb Agreement › View
The rivers ____________ very dirty because of rubbish.
A. is
B. are